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Server JSON Output Does Not Report Client's Results
PLEASE NOTE the following text from the iperf3 license. Submitting a pull request to the iperf3 repository constitutes "[making] Enhancements available...publicly":
You are under no obligation whatsoever to provide any bug fixes, patches, or
upgrades to the features, functionality or performance of the source code
("Enhancements") to anyone; however, if you choose to make your Enhancements
available either publicly, or directly to Lawrence Berkeley National
Laboratory, without imposing a separate written license agreement for such
Enhancements, then you hereby grant the following license: a non-exclusive,
royalty-free perpetual license to install, use, modify, prepare derivative
works, incorporate into other computer software, distribute, and sublicense
such enhancements or derivative works thereof, in binary and source code form.
The complete iperf3 license is available in the LICENSE file in the
top directory of the iperf3 source tree.
-
Version of iperf3 (or development branch, such as
masteror3.1-STABLE) to which this pull request applies:master -
Issues fixed (if any): iperf/#1410
-
Brief description of code changes (suitable for use as a commit message):
On the iperf server, no results are displayed from the client's side, even though this information is sent to the server. It appears that the reporter callback was called prior to setting the test state to DISPLAY_RESULTS. Moving the call to the reporter callback function to after that state is set seems to fix the issue, as I can now see the client's results displayed in the server's JSON output.
Server JSON
{
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 5202,
"remote_host": "127.0.0.1",
"remote_port": 54714
}],
"version": "iperf 3.19+",
"system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64",
"sock_bufsize": 0,
"sndbuf_actual": 16384,
"rcvbuf_actual": 131072,
"timestamp": {
"time": "Mon, 14 Jul 2025 17:47:32 GMT",
"timesecs": 1752515252,
"timemillisecs": 1752515252430
},
"accepted_connection": {
"host": "127.0.0.1",
"port": 54708
},
"cookie": "6qnxxmqahsmytu7tr3spkqhgrk7irlyktagx",
"tcp_mss_default": 0,
"target_bitrate": 0,
"fq_rate": 500000000,
"test_start": {
"protocol": "TCP",
"num_streams": 1,
"blksize": 131072,
"omit": 1,
"duration": 2,
"bytes": 0,
"blocks": 0,
"reverse": 0,
"tos": 0,
"target_bitrate": 0,
"bidir": 0,
"fqrate": 500000000,
"interval": 1
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.001054,
"seconds": 1.001054048538208,
"bytes": 62914560,
"bits_per_second": 502786518.6050337,
"omitted": true,
"sender": false
}],
"sum": {
"start": 0,
"end": 1.001054,
"seconds": 1.001054048538208,
"bytes": 62914560,
"bits_per_second": 502786518.6050337,
"omitted": true,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 1.3e-05,
"end": 1.000991,
"seconds": 1.0010039806365967,
"bytes": 62521344,
"bits_per_second": 499669093.90501356,
"omitted": false,
"sender": false
}],
"sum": {
"start": 1.3e-05,
"end": 1.000991,
"seconds": 1.0010039806365967,
"bytes": 62521344,
"bits_per_second": 499669093.90501356,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 1.000991,
"end": 2.001042,
"seconds": 1.0000510215759277,
"bytes": 62390272,
"bits_per_second": 499096711.29924917,
"omitted": false,
"sender": false
}],
"sum": {
"start": 1.000991,
"end": 2.001042,
"seconds": 1.0000510215759277,
"bytes": 62390272,
"bits_per_second": 499096711.29924917,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 2.001042,
"end": 2.002375,
"seconds": 0.0013330000219866633,
"bytes": 131072,
"bits_per_second": 786628644.189543,
"omitted": false,
"sender": false
}],
"sum": {
"start": 2.001042,
"end": 2.002375,
"seconds": 0.0013330000219866633,
"bytes": 131072,
"bits_per_second": 786628644.189543,
"omitted": false,
"sender": false
}
}],
"end": {
"streams": [{
"sender": {
"socket": 5,
"start": 0,
"end": 2.002327,
"seconds": 2.002327,
"bytes": 124649472,
"bits_per_second": 498018443.54094,
"retransmits": 0,
"reorder": 0,
"max_snd_cwnd": 0,
"max_snd_wnd": 0,
"max_rtt": 0,
"min_rtt": 0,
"mean_rtt": 0,
"sender": false
},
"receiver": {
"socket": 5,
"start": 0,
"end": 2.002375,
"seconds": 2.002375,
"bytes": 125042688,
"bits_per_second": 499577503.71433926,
"sender": false
}
}],
"sum_sent": {
"start": 0,
"end": 2.002327,
"seconds": 2.002327,
"bytes": 124649472,
"bits_per_second": 498018443.54094,
"retransmits": 0,
"sender": false
},
"sum_received": {
"start": 0,
"end": 2.002375,
"seconds": 2.002375,
"bytes": 125042688,
"bits_per_second": 499577503.71433926,
"sender": false
},
"cpu_utilization_percent": {
"host_total": 2.0814591122934472,
"host_user": 0.16557515140820453,
"host_system": 1.9158839608852427,
"remote_total": 1.5036114967449765,
"remote_user": 0.023864735875288281,
"remote_system": 1.4797800450201419
},
"sender_tcp_congestion": "cubic",
"receiver_tcp_congestion": "cubic"
}
}
Client JSON
{
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 54714,
"remote_host": "127.0.0.1",
"remote_port": 5202
}],
"version": "iperf 3.19+",
"system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64",
"timestamp": {
"time": "Mon, 14 Jul 2025 17:47:32 GMT",
"timesecs": 1752515252,
"timemillisecs": 1752515252430
},
"connecting_to": {
"host": "127.0.0.1",
"port": 5202
},
"cookie": "6qnxxmqahsmytu7tr3spkqhgrk7irlyktagx",
"tcp_mss_default": 32768,
"target_bitrate": 0,
"fq_rate": 500000000,
"sock_bufsize": 0,
"sndbuf_actual": 16384,
"rcvbuf_actual": 131072,
"test_start": {
"protocol": "TCP",
"num_streams": 1,
"blksize": 131072,
"omit": 1,
"duration": 2,
"bytes": 0,
"blocks": 0,
"reverse": 0,
"tos": 0,
"target_bitrate": 0,
"bidir": 0,
"fqrate": 500000000,
"interval": 1
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.000937,
"seconds": 1.0009369850158691,
"bytes": 65404928,
"bits_per_second": 522749615.44327831,
"retransmits": 0,
"snd_cwnd": 654830,
"snd_wnd": 6127872,
"rtt": 1083,
"rttvar": 9,
"pmtu": 65535,
"reorder": 0,
"omitted": true,
"sender": true
}],
"sum": {
"start": 0,
"end": 1.000937,
"seconds": 1.0009369850158691,
"bytes": 65404928,
"bits_per_second": 522749615.44327831,
"retransmits": 0,
"omitted": true,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 8.6e-05,
"end": 1.00049,
"seconds": 1.0005760192871094,
"bytes": 62259200,
"bits_per_second": 497786865.16479534,
"retransmits": 0,
"snd_cwnd": 654830,
"snd_wnd": 6127872,
"rtt": 1083,
"rttvar": 7,
"pmtu": 65535,
"reorder": 0,
"omitted": false,
"sender": true
}],
"sum": {
"start": 8.6e-05,
"end": 1.00049,
"seconds": 1.0005760192871094,
"bytes": 62259200,
"bits_per_second": 497786865.16479534,
"retransmits": 0,
"omitted": false,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 1.00049,
"end": 2.002327,
"seconds": 1.0018370151519775,
"bytes": 62390272,
"bits_per_second": 498206962.26150489,
"retransmits": 0,
"snd_cwnd": 654830,
"snd_wnd": 6127872,
"rtt": 1091,
"rttvar": 20,
"pmtu": 65535,
"reorder": 0,
"omitted": false,
"sender": true
}],
"sum": {
"start": 1.00049,
"end": 2.002327,
"seconds": 1.0018370151519775,
"bytes": 62390272,
"bits_per_second": 498206962.26150489,
"retransmits": 0,
"omitted": false,
"sender": true
}
}],
"end": {
"streams": [{
"sender": {
"socket": 5,
"start": 0,
"end": 2.002327,
"seconds": 2.002327,
"bytes": 124649472,
"bits_per_second": 498018443.54094,
"retransmits": 0,
"reorder": 0,
"max_snd_cwnd": 654830,
"max_snd_wnd": 6127872,
"max_rtt": 1091,
"min_rtt": 1083,
"mean_rtt": 1085,
"sender": true
},
"receiver": {
"socket": 5,
"start": 0,
"end": 2.002375,
"seconds": 2.002327,
"bytes": 125042688,
"bits_per_second": 499577503.71433926,
"sender": true
}
}],
"sum_sent": {
"start": 0,
"end": 2.002327,
"seconds": 2.002327,
"bytes": 124649472,
"bits_per_second": 498018443.54094,
"retransmits": 0,
"sender": true
},
"sum_received": {
"start": 0,
"end": 2.002375,
"seconds": 2.002375,
"bytes": 125042688,
"bits_per_second": 499577503.71433926,
"sender": true
},
"cpu_utilization_percent": {
"host_total": 1.5036114967449765,
"host_user": 0.023864735875288281,
"host_system": 1.4797800450201419,
"remote_total": 2.0814591122934472,
"remote_user": 0.16557515140820453,
"remote_system": 1.9158839608852427
},
"sender_tcp_congestion": "cubic",
"receiver_tcp_congestion": "cubic"
}
}
Update 07-14-2025
My first round of changes were breaking. Moving the call to the reporter callback function would break --get-server-output by leaving the end section empty. The root of this issue is that the server calls the callback BEFORE receiving results from the client as part of iperf_exchange_results. The expected behavior for the server is as follows:
- Set the state to
EXCHANGE_RESULTS. - Get results from the client.
- Use the results from the client to finalize/populate the JSON output for the server's output.
- Send the server's JSON result to the client.
The latest changes reflect this flow, and a change to the report callback was made to also trigger for the EXCHANGE_RESULTS test state. I have not thoroughly tested how that change impacts other areas of the code, so I would definitely appreciate any thoughts for concern there from the maintainers.
Server JSON
iperf3 -s -p 5202 --json
{
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 5202,
"remote_host": "127.0.0.1",
"remote_port": 51526
}, {
"socket": 9,
"local_host": "127.0.0.1",
"local_port": 5202,
"remote_host": "127.0.0.1",
"remote_port": 51536
}],
"version": "iperf 3.19+",
"system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64",
"sock_bufsize": 0,
"sndbuf_actual": 16384,
"rcvbuf_actual": 131072,
"timestamp": {
"time": "Mon, 14 Jul 2025 20:34:46 GMT",
"timesecs": 1752525286,
"timemillisecs": 1752525286818
},
"accepted_connection": {
"host": "127.0.0.1",
"port": 51516
},
"cookie": "abwqn6l3lf5qjnjygqipc43uzk2jt7q5wdpu",
"tcp_mss_default": 0,
"target_bitrate": 0,
"fq_rate": 500000000,
"test_start": {
"protocol": "TCP",
"num_streams": 2,
"blksize": 131072,
"omit": 1,
"duration": 2,
"bytes": 0,
"blocks": 0,
"reverse": 0,
"tos": 0,
"target_bitrate": 0,
"bidir": 0,
"fqrate": 500000000,
"interval": 1
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.000216,
"seconds": 1.000216007232666,
"bytes": 62783488,
"bits_per_second": 502159433.93031961,
"omitted": true,
"sender": false
}, {
"socket": 9,
"start": 0,
"end": 1.000226,
"seconds": 1.0002260208129883,
"bytes": 62783488,
"bits_per_second": 502154406.65276271,
"omitted": true,
"sender": false
}],
"sum": {
"start": 0,
"end": 1.000216,
"seconds": 1.000216007232666,
"bytes": 125566976,
"bits_per_second": 1004318867.8606392,
"omitted": true,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 5.1e-05,
"end": 1.00097,
"seconds": 1.0010210275650024,
"bytes": 62521344,
"bits_per_second": 499660584.76980478,
"omitted": false,
"sender": false
}, {
"socket": 9,
"start": 4.1e-05,
"end": 1.000977,
"seconds": 1.0010180473327637,
"bytes": 62521344,
"bits_per_second": 499662072.35995078,
"omitted": false,
"sender": false
}],
"sum": {
"start": 5.1e-05,
"end": 1.00097,
"seconds": 1.0010210275650024,
"bytes": 125042688,
"bits_per_second": 999321169.53960955,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 1.00097,
"end": 2.000962,
"seconds": 0.9999920129776,
"bytes": 62521344,
"bits_per_second": 500174746.90690744,
"omitted": false,
"sender": false
}, {
"socket": 9,
"start": 1.000977,
"end": 2.000968,
"seconds": 0.999990999698639,
"bytes": 62521344,
"bits_per_second": 500175253.728017,
"omitted": false,
"sender": false
}],
"sum": {
"start": 1.00097,
"end": 2.000962,
"seconds": 0.9999920129776,
"bytes": 125042688,
"bits_per_second": 1000349493.8138149,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 2.000962,
"end": 2.00393,
"seconds": 0.0029680000152438879,
"bytes": 131072,
"bits_per_second": 353293798.724538,
"omitted": false,
"sender": false
}, {
"socket": 9,
"start": 2.000968,
"end": 2.003932,
"seconds": 0.0029639999847859144,
"bytes": 131072,
"bits_per_second": 353770582.1127854,
"omitted": false,
"sender": false
}],
"sum": {
"start": 2.000962,
"end": 2.00393,
"seconds": 0.0029680000152438879,
"bytes": 262144,
"bits_per_second": 706587597.449076,
"omitted": false,
"sender": false
}
}],
"end": {
"streams": [{
"sender": {
"socket": 5,
"start": 0,
"end": 2.003197,
"seconds": 2.003197,
"bytes": 124649472,
"bits_per_second": 497802151.261209,
"retransmits": 0,
"reorder": 0,
"max_snd_cwnd": 0,
"max_snd_wnd": 0,
"max_rtt": 0,
"min_rtt": 0,
"mean_rtt": 0,
"sender": false
},
"receiver": {
"socket": 5,
"start": 0,
"end": 2.00393,
"seconds": 2.00393,
"bytes": 125173760,
"bits_per_second": 499713103.751129,
"sender": false
}
}, {
"sender": {
"socket": 9,
"start": 0,
"end": 2.003197,
"seconds": 2.003197,
"bytes": 124649472,
"bits_per_second": 497802151.261209,
"retransmits": 0,
"reorder": 0,
"max_snd_cwnd": 0,
"max_snd_wnd": 0,
"max_rtt": 0,
"min_rtt": 0,
"mean_rtt": 0,
"sender": false
},
"receiver": {
"socket": 9,
"start": 0,
"end": 2.00393,
"seconds": 2.00393,
"bytes": 125173760,
"bits_per_second": 499713103.751129,
"sender": false
}
}],
"sum_sent": {
"start": 0,
"end": 2.003197,
"seconds": 2.003197,
"bytes": 249298944,
"bits_per_second": 995604302.522418,
"retransmits": 0,
"sender": false
},
"sum_received": {
"start": 0,
"end": 2.00393,
"seconds": 2.00393,
"bytes": 250347520,
"bits_per_second": 999426207.502258,
"sender": false
},
"cpu_utilization_percent": {
"host_total": 4.3199350250562958,
"host_user": 0.279305713434535,
"host_system": 4.04059602527765,
"remote_total": 3.0420990823002212,
"remote_user": 1.4897442849610014,
"remote_system": 1.5523547973392195
},
"sender_tcp_congestion": "cubic",
"receiver_tcp_congestion": "cubic"
}
}
Client JSON
iperf3 -c 127.0.0.1 --fq-rate 0.5Gb/1s --time 2 --omit 1 --parallel 2 --json --congestion cubic --port 5202 --get-server-output
{
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 51526,
"remote_host": "127.0.0.1",
"remote_port": 5202
}, {
"socket": 8,
"local_host": "127.0.0.1",
"local_port": 51536,
"remote_host": "127.0.0.1",
"remote_port": 5202
}],
"version": "iperf 3.19+",
"system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64",
"timestamp": {
"time": "Mon, 14 Jul 2025 20:34:46 GMT",
"timesecs": 1752525286,
"timemillisecs": 1752525286818
},
"connecting_to": {
"host": "127.0.0.1",
"port": 5202
},
"cookie": "abwqn6l3lf5qjnjygqipc43uzk2jt7q5wdpu",
"tcp_mss_default": 32768,
"target_bitrate": 0,
"fq_rate": 500000000,
"sock_bufsize": 0,
"sndbuf_actual": 16384,
"rcvbuf_actual": 131072,
"test_start": {
"protocol": "TCP",
"num_streams": 2,
"blksize": 131072,
"omit": 1,
"duration": 2,
"bytes": 0,
"blocks": 0,
"reverse": 0,
"tos": 0,
"target_bitrate": 0,
"bidir": 0,
"fqrate": 500000000,
"interval": 1
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.000852,
"seconds": 1.0008519887924194,
"bytes": 65404928,
"bits_per_second": 522794009.36327845,
"retransmits": 0,
"snd_cwnd": 654830,
"snd_wnd": 3858944,
"rtt": 1078,
"rttvar": 10,
"pmtu": 65535,
"reorder": 0,
"omitted": true,
"sender": true
}, {
"socket": 8,
"start": 0,
"end": 1.000856,
"seconds": 1.0008560419082642,
"bytes": 65404928,
"bits_per_second": 522791892.23094958,
"retransmits": 0,
"snd_cwnd": 654830,
"snd_wnd": 6127872,
"rtt": 1084,
"rttvar": 6,
"pmtu": 65535,
"reorder": 0,
"omitted": true,
"sender": true
}],
"sum": {
"start": 0,
"end": 1.000852,
"seconds": 1.0008519887924194,
"bytes": 130809856,
"bits_per_second": 1045588018.7265569,
"retransmits": 0,
"omitted": true,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 5.2e-05,
"end": 1.000946,
"seconds": 1.0009980201721191,
"bytes": 62259200,
"bits_per_second": 497577008.10872483,
"retransmits": 0,
"snd_cwnd": 654830,
"snd_wnd": 3858944,
"rtt": 1062,
"rttvar": 17,
"pmtu": 65535,
"reorder": 0,
"omitted": false,
"sender": true
}, {
"socket": 8,
"start": 4.8e-05,
"end": 1.000952,
"seconds": 1.0010000467300415,
"bytes": 62259200,
"bits_per_second": 497576000.74750531,
"retransmits": 0,
"snd_cwnd": 654830,
"snd_wnd": 6127872,
"rtt": 1081,
"rttvar": 14,
"pmtu": 65535,
"reorder": 0,
"omitted": false,
"sender": true
}],
"sum": {
"start": 5.2e-05,
"end": 1.000946,
"seconds": 1.0009980201721191,
"bytes": 124518400,
"bits_per_second": 995154016.21744967,
"retransmits": 0,
"omitted": false,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 1.000946,
"end": 2.003197,
"seconds": 1.0022510290145874,
"bytes": 62390272,
"bits_per_second": 498001160.93743163,
"retransmits": 0,
"snd_cwnd": 654830,
"snd_wnd": 3858944,
"rtt": 1084,
"rttvar": 14,
"pmtu": 65535,
"reorder": 0,
"omitted": false,
"sender": true
}, {
"socket": 8,
"start": 1.000952,
"end": 2.0032,
"seconds": 1.0022480487823486,
"bytes": 62390272,
"bits_per_second": 498002641.767568,
"retransmits": 0,
"snd_cwnd": 654830,
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}
}
Thanks for the PR! Admittedly we want to be a little careful with the order of operations, just something we would need to test for this (and any other similar) code change.
@bmah888, I agree, and after further testing, these changes will need more thought from my end. I've moved this PR into a draft state and will add some updates to the template with more meaningful findings and a description of the new changes.
These changes will have to wait for #1956. Merging those changes will resolve the failing tests in the pipeline.